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A method for preparing porous cerium-based oxides from a water-soluble cerium precursor

A water-soluble, composite oxide technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., can solve problems such as product collapse and complex preparation of cerium precursors, and achieve simple preparation, superior catalytic performance, and improved ratio The effect of surface area

Inactive Publication Date: 2016-06-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although porous cerium oxides with special morphology can be obtained by calcining various cerium precursors, there are problems such as the preparation of cerium precursors is relatively complicated, high-temperature calcination is required, and the product is easy to collapse during the calcination process.

Method used

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  • A method for preparing porous cerium-based oxides from a water-soluble cerium precursor
  • A method for preparing porous cerium-based oxides from a water-soluble cerium precursor
  • A method for preparing porous cerium-based oxides from a water-soluble cerium precursor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation method of flower-like water-soluble cerium precursor and cerium-based oxide

[0030] 148mgCeCl 3 ·7H 2 O was dissolved in 15.75ml absolute ethanol, and 0.25ml H was added at room temperature 2 SO 4 (5M) solution, stirred and reacted for 10 minutes, transferred to the reaction kettle, and kept at 160° C. for 3 hours; cooled, washed with ethanol several times, and dried to obtain a flower-shaped water-soluble cerium precursor;

[0031] Take 150 mg of the above cerium precursor and add 30 ml of saturated NaOH ethanol solution, let it stand at room temperature for 2 days, wash and dry, and then the flower-like cerium-based oxide can be obtained.

Embodiment 2

[0033] Preparation method of rod-shaped water-soluble cerium precursor and cerium-based oxide

[0034] 148mgCeCl 3 ·7H 2 O was dissolved in 14.67ml absolute ethanol, and 1.33ml H was added at room temperature 2 SO 4 (0.75M) solution, stirred and reacted for 10 minutes, transferred to the reaction kettle, and kept at 160°C for 3 hours; cooled, washed with ethanol several times, and dried to obtain a rod-shaped water-soluble cerium precursor;

[0035] Take 150 mg of the above-mentioned cerium precursor and add 30 ml of saturated NaOH ethanol solution, let it stand at room temperature for 2 days, wash and dry, and the rod-shaped cerium-based oxide can be obtained.

Embodiment 3

[0037] Preparation method of porous cerium-copper composite oxide

[0038] Weigh 0.5mmolCu(ac) 2 ·H 2 Dissolve O in absolute ethanol; disperse 150 mg of cerium-based oxide in ethanol solution, stir for 10 minutes, transfer to a reaction kettle, and keep at 120°C for 6 hours; cool, wash and dry to obtain porous cerium-copper composite oxides.

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Abstract

The invention provides a method for preparing porous cerium-based oxide from a water-soluble cerium precursor. To be specific, the water-soluble cerium precursor is obtained through reaction of cerium salt and concentrated sulfuric acid in absolute ethyl alcohol; porous cerium dioxide is obtained in the following way: the cerium precursor and an ethanol solution of NaOH have solid-liquid interface reaction, and then washing is carried out to remove the cerium precursor not completely reacted; the cerium-based composite oxide is obtained through reaction of porous cerium dioxide and an ethanol solution of metal salt under the heating condition. During the preparation process of the cerium precursor, the cerium precursor with different shapes can be obtained through changing the experiment parameters including concentration of sulfuric acid, reaction temperature, reaction time and the like to further adjust and control the shape of the porous cerium-based oxide. According to the invention, the method is simple and practical, the controllability is high, the pollution is small, the cost is low, and certain universality is realized. The prepared product has a mesoporous structure; the synergistic effect among all components in the composite oxide enables the components to express superior catalytic activity during CO catalytic reaction.

Description

technical field [0001] The invention belongs to the technical field of functional materials. Specifically, the invention relates to a method for preparing cerium-based oxides from a water-soluble cerium precursor, in particular to a method for preparing porous cerium oxides and composite oxides thereof. Background technique [0002] Porous metal oxides with micro-nano structure have the characteristics of low density, high porosity, and high specific surface area, so they are widely used in different fields such as gas-phase catalysis, drug sustained release, and gas-sensitive materials. [0003] Among various metal oxides, cerium oxide is due to its superior oxygen storage capacity and Ce 3+ / C 4+ Due to the advantages of efficient reversible conversion between them, it has attracted much attention in the field of catalysis. At present, the preparation of porous cerium oxides and cerium-based composite oxides is mainly prepared under high-temperature calcination condition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00B01J23/10B01J23/83
Inventor 陈国柱孙国新徐启慧王勇宋国隆
Owner UNIV OF JINAN
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